摘要
输入电压和负载宽范围变化时,变频控制LCC谐振变换器的开关频率变化范围宽,而移相控制LCC谐振变换器难以实现宽范围零电压关断(zero voltage switching,ZVS)。为了在较窄开关频率范围内实现LCC谐振变换器的宽范围软开关,该文提出一种脉宽-脉频调制(pulse width modulation-pulse frequency modulation,PWM-PFM)混合控制LCC变换器。通过同时调整LCC变换器原边开关管的导通角与开关频率,在宽输入电压和宽负载变化范围内,提出的PWM-PFM混合控制LCC变换器能在稳压输出的同时保持变换器ZVS软开关工作。此外,PWM-PFM混合控制LCC谐振变换器的开关频率范围较窄,简化了变换器磁性元件的设计。以工作在电容电压连续模式(continuous capacitor voltage mode,CCVM)的LCC谐振变换器为例,利用基波近似法,分析PWM-PFM混合控制LCC谐振变换器的工作原理和控制特性,对谐振元件和控制参数进行设计。最后,通过一台100~200V输入、48V/500W输出的实验样机验证了理论分析的正确性。
Variable frequency controlled LCC resonant converter suffers from wide switching frequency variation, while phase-shift controlled LCC resonant converter loses ZVS operation when input voltage or load variation range is wide. A PWM-PFM hybrid controlled LCC was proposed to achieve ZVS operation with narrow switching frequency variation under wide input voltage and load variation. By modulating conduction angle and switching frequency simultaneously, the proposed converter can achieve voltage regulation without losing ZVS operation under wide input voltage and load variation. Furthermore, the proposed converter simplifies the design of magnetic components due to the narrow switching frequency variation. Fundamental harmonic approach(FHA) model of converter was derived. Operation principle and circuit characteristics were analyzed under continuous capacitor voltage mode(CCVM). The parameter design was given. Finally, experiment results of a 100~200 V input and 48 V/500 W output prototype were provided to verify the theoretical analysis results.
引文
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